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premchai21
<p>The single-quote character is part of a double-quoted string, the curly braces do have Perl code inside them, and the parens define an implicit subrule, which should be interpretable but apparently isn't. Thanks for taking a look anyway.</p>
<p>As far as the intermediate steps, I created many subrules, then tested them individually first, which does approximately the same thing IINM.</p>
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